enhance booleans

[alexlamsl]

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[alexlamsl]

@kzc uglify-js has come a long way − I've found an old TODO (back when fromString: true was a thing):

function foo(x) {
    if (x) {
        return bar(1);
        var a = not_called(1);
    } else {
        return bar(2);
        var b = not_called(2);
    }
    var c = bar(3);
    function bar(x) { return 7 - x; }
    function nope() {}
    return b || c;
}

with current master this gives:

$ uglifyjs todo.js -bc
function foo(x) {
    return x ? 6 : 5;
}

[kzc]

Wow - in a single pass no less!

reduce_vars is doing most of the heavy lifting. I though inline played a role in this example - but not the case:

$ uglify-js todo.js -bc inline=0,collapse_vars=0
function foo(x) {
    return x ? 6 : 5;
}

$ uglify-js todo.js -bc inline=0,collapse_vars=0,evaluate=0
function foo(x) {
    return x ? bar(1) : bar(2);
    function bar(x) {
        return 7 - x;
    }
}

Must be evaluate doing the call inlining.

[alexlamsl]

inline can do something here:

$ uglify-js todo.js -bc evaluate=0
function foo(x) {
    return x ? 7 - 1 : 7 - 2;
}

evaluate steals the spotlight because the results are constants, but if you replace that 7 with say A then inline will shine through 😉